#include <iostream>
using namespace std;
#include <string>
class Human {
 private:
  string name;
  int age;

 public:
  Human() {
    name = "jack";
    age = 24;
    // cout<<"not set"<<endl;
  }
  Human(string humanName, int humanAge) {
    name = humanName;
    age = humanAge;
  }
  void IntroduceSelf() {
    cout << "I am " << name << endl;
    cout << age << " years old" << endl;
  }
};

int main() {
  Human human;
  human.IntroduceSelf();
  Human human1("Lili", 25);
  human1.IntroduceSelf();
  return 0;
}
